Failed to load due to SparseStructuresConfig.customSpreadFactors()

[PapiOphidian]

When attempting to load a dedicated server with sparsestructures 2.1 (1.20.2), every structure fails to load because the return value of SparseStructuresConfig.customSpreadFactors() is null

I hacked an if null, return an empty new class that impl List else return this.customSpreadFactors and that seems to load things fine. Untested if it actually makes a difference however.

Stack trace snippet (repeat for every structure vanilla and modded):

> Errors in registry minecraft:worldgen/structure_set:
>> Errors in element minecraft:ancient_cities:
java.lang.IllegalStateException: Failed to parse minecraft:worldgen/structure_set/ancient_cities.json from pack vanilla
        at net.minecraft.class_7655.method_45122(class_7655.java:179)
        at net.minecraft.class_7655$class_7657.method_45132(class_7655.java:61)
        at net.minecraft.class_7655.method_45120(class_7655.java:98)
        at java.base/java.lang.Iterable.forEach(Iterable.java:75)
        at net.minecraft.class_7655.method_45121(class_7655.java:98)
        at net.minecraft.class_7237.method_45142(class_7237.java:67)
        at net.minecraft.class_7237.method_45143(class_7237.java:71)
        at net.minecraft.class_7237.method_42098(class_7237.java:34)
        at net.minecraft.server.Main.method_43612(Main.java:159)
        at net.minecraft.class_156.method_43498(class_156.java:945)
        at net.minecraft.class_156.method_43499(class_156.java:939)
        at net.minecraft.server.Main.main(Main.java:157)
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23)
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69)
Caused by: java.lang.NullPointerException: Cannot invoke "java.util.List.stream()" because the return value of "io.github.maxencedc.sparsestructures.SparseStructuresConfig.customSpreadFactors()" is null
        at net.minecraft.class_7655.handler$dok000$sparsestructures$load(class_7655.java:1028)
        at net.minecraft.class_7655.method_45122(class_7655.java:175)
        ... 15 more

[MaxenceDC]

This seems like a bad issue, thank you for the report! I will try to reproduce and fix it asap.

[PapiOphidian]

I tried to load the server with my hack and it didn't load, but there were no errors. Granted, there were other mods that messed with world gen, so that may be it but idk.

[MaxenceDC]

Sorry for the late reply, do you happen to have a list of the worldgen mods you were using?

[PapiOphidian]

blossom blade
c2me
dungeons and taverns
dungeons arise
explorify
incendium
nullscape
repurposed structures
sky villages
snow under trees
starlight
structory + towers
terralith